GE EPM 9650/9800 User Manual
3-1
Chapter 3
Communication Data Formats
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This chapter expands upon information listed in the EPM Modbus Register Map (Chapter 2). Section
Headings (F1, F2, etc) refer to the value in the Register Map’s “Type” column.
Headings (F1, F2, etc) refer to the value in the Register Map’s “Type” column.
3.1: Type F1 Null Terminated ASCII String
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Length: Depends on the reading.
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Each register contains two bytes. Each byte stands for an ASCII character. The printable portion of
the string is terminated with a Null character (ASCII 00H). Any characters after the terminating
Null are ignored.
the string is terminated with a Null character (ASCII 00H). Any characters after the terminating
Null are ignored.
Example:
Registers 00001 – 00008, the Device Name, might contain the following data:
Registers 00001 – 00008, the Device Name, might contain the following data:
3.2: Type F2 Fixed Length ASCII String
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Length: Depends on the reading.
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Each register contains two bytes. Each byte stands for an ASCII character. All bytes are significant.
There is no terminating character.
There is no terminating character.
Example:
Registers 00073 – 00074, the EPM Comm Boot Version Number, might contain the following data:
Registers 00073 – 00074, the EPM Comm Boot Version Number, might contain the following data:
ASCII
Address
Value
Bytes
Register
String
30H 31H 30H
37H 20H 43H 65H 78H 75H 73H 20H 31H 32H 37H 37H 32H
Null
‘2’
‘7’
‘2’
‘1’
‘ ‘
‘s’
‘u’
‘x’
‘e’
‘N’
‘ ‘
‘7’
‘0’
‘1’
‘0’
“2”
“27”
“ 1”
“us”
“ex”
“ N”
“07”
“01”
“0107 EPM 9800”
3200H
3237H
2031H
7573H
6578H
204EH
3037H
3031H
00001
00002
00003
00004
00005
00006
00007
00008